[Freeswitch-users] FAS detection with FS

[Vlasis Hatzistavrou (KTI)]

Hello Ahmed,

I don't think there is a reliable way to detect FAS on a per call basis. 
Even audio detection software can be confused by strange ringtones, 
answering machines, etc.

The most reliable way we have found is to use statistics from CDRs and 
see if the INVITE-to-200(OK) delay averaged over a number of calls 
appears to be too small. If it is, then it is possible that you got FAS 
for those calls.

But this can only tell you if you have been experiencing FAS in past 
calls, ie you will not know you are getting FAS in real time.

It is still useful however: after you detect a possible FAS case via 
statistics you can place a few test calls yourself to verify that there 
actually exists FAS (and this is the only information that a carrier 
will accept in a trouble ticket to prove to them that they actually give 
you FAS).

I hope this helps.

Best regards,
Vlasis Hatzistavrou.


On 8/1/10 3:05 ??, Ahmed Naji wrote:
> Hi everyone,
>
> Was just wondering what/if anyone is doing any work on FAS detection 
> and spoofed ring tones. Be great to discuss some ideas.
>
> Regards,
>
> Ahmed.
>
> -- 
> Ahmed Naji
>
>
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